Briefcase



FIG. 1 is a front perspective view of a briefcase;

FIG. 2 is a front view of a briefcase;

FIG. 3 is a rear view of a briefcase;

FIG. 4 is a left side view of a briefcase;

FIG. 5 is a right side view of a briefcase;

FIG. 6 is a top view of a briefcase; and,

FIG. 7 is a bottom view of a briefcase.

The broken lines shown in the figures illustrate portions of thebriefcase and form no part of the claimed design.

CLAIM The ornamental design for a briefcase, as shown and described.